The Vertform concrete formwork system was developed by Ant Hire as an alternative to traditional construction methods for creating manhole bases and inverts in a range of sizes

1. Manhole Construction:
A Reusable GRP Invert
Shuttering System

2. Learning Aims and Objectives
• Methods of manhole construction and the challenges faced when
constructing manholes
• How to use an invert shuttering system and its results
• When can an invert shuttering system be used.

3. What problems are faced when
constructing manholes?

4. Understanding different methods of
manhole construction

5. Rough Forming
• Base created manually with a
shovel using semi-dry
concrete
• Finished with a layer of
smooth concrete

6. Rough Shuttering
• Plywood and timber boats are
used to create a channel in the
manhole base
• Finished by hand

7. Half Pipe Segments
• Segments set in semi-dry concrete to form the base
• Finished by hand

8. Bespoke Timber Formwork
• Made to suit each individual
structure
• Can accommodate additions such
as sumps and hydro-break
systems

9. • Made to create watertight manhole inverts
and bases in a single operation
• Eliminates the need for concrete remedial
work
• No hand finishing required
• Correct profile can be created consistently
• Reusable

10. How To Use The Vertform
Shuttering System

11. • Base components are selected to form the required
angle
• Any angle between 90 degrees and 180 degrees can be
accommodated

12. • The side components are attached to the base, and the
Verform is secured in place using jacks

13. • Once complete, the entire shutter is sprayed with releasing
agent and vibrated concrete is poured around the mould
• Once set, the Vertform can be easily removed

14. Vertform Applications

15. Pipe Diameter Changes

16. T Connections

17. Extra Long Channels

18. Landing Bays

19. Single End Fixing

20. Side Connections

21. Rebate for Double Step Irons

25. Summary - Learning Outcomes
• An understanding of manhole construction
• An understanding of how the different methods compare
• An understanding of how to use the Vertform system

26. Ant Hire Solutions
www.anthire.co.uk
0845 125 9595
Manhole construction using an Invert Shuttering System